Carburetor



throttle.

Patented oci. ie i923.

UNITED STATES tirare PATENT Orrin.

DON COLE, OF CHICAGO, ILLINOIS, ASSIGNOR T0 STROMBERG MOTOR DEVICES COM-PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CARBURETOR.

- `Application filed March 16, 1916. Serial No. 84,594.

To aZZ whom it may concern:

Beit known that I, DON CoLn, a citizen of the United States, residing atChicago, in

the county of Cook and State ot Illinois,

have invented a cert-ain new and useful Improvement in Carburetors, ofwhich the following is a full, clear,` concise,a nd exact description,reference being had to the accompanying drawings, forming, a partof thisspecification.

My invention relates to carburetors for internal combustion engines andits purpose is the provision of such a device which will proportion theair and fuel in a more simple, accurate and effective way than hashereto fore been possible and whichwill morev thoroughly and more nearlycompletely atomize the liquid fuel than has heretoiore been possible,throughout the entire range of speeds and loads which such engines aremade to assume in modern automobile and allied practices.v

Further objects of my invention are to embody the featuresivwhichprocure the results above outlined in a simple and inexpensivestructure, -to make' these `features i simply and reliably4 operative,and to-make them readily usable by the average operator.

I employ a carbureting passageway having a portion thereof preferably inthe form ot a Venturi tube,and a throttle valve controlling saidpassageway, there being a comparatively small air and fuel passagewayleading to the carburet'ing passageway. Into this comparatively smallpassageway, towhich air is admitted liquid fuel is fed, and thatpassageway may, therefore, be viewed either as a small carburetingpassageway through which air passes and to which gasolline is fed, or asan air bled fuel nozzle. In this comparatively small passagewaypreliminary mixing takes place, and the liquid fuel is so fed into thispassageway as to 'cause it to be subject to aspiration. The admission ofair to this passageway is valve controlled. directly or indirectly bythe main I have herein shown an anterior throttle device, and in such adevice, the preliminary mixture may form the proper mixture for idlingand low running. On

the higher speeds this preliminary flow then joins the How lcontrolledby the main throttle. v

My invention will be more readily 4understood by reference lto.. theaccompanying the engine manifold. In the Venturi tube.

10, which I form or dispose in the carbureting passageway, a fuel nozzle11 is arranged in the most effective place for aspiration, this nozzle11 being fed with yfuel by means of a tube 35 from a well 38, having arestricted air opening 89. rThis well is fed tl'irough an opening 38afrom a chamber 1G in which means 17 are provided for maintaining` asubstantially constant level of liquid fuel, the liquid fuel being ted'to the chamber by means of the inlet 18.

A throttle valve 19 is pivoted upon a shaft 20 extending across thecarbureting passage;- way 6. this throttle valve being on the air inletside of the nozzle 11. This'is the usual is in wide open position therewill be a slighty bleed therethrough into the passageway 21. As theshaft Q() turns to close the valve '19, such turning movement results inthe swing ing ot the opening il? into axial coincidence with thepassageway Q1. It is obvious, of course, that the'throttle shaft 20 ismoved in the usual way by means ot an operating lever 26. The fuel tuhe35 leads trom adjacent the bottom ot the well and discharges into thenozzle ll. particularly at a. portion 100 thereof made in the form of laVenturi tube 36 so as to emphasize the aspirating efi'cct ot the airentering by way ot the bleed passageway 21.

It will now be seen that when the throttle 105 valve 19 is closed, orpractically closed, a comparatively slight amount ot air enters thepassageway 21. The engine suction applied to thenozzle 11, when theengine is turned over, draws in air through the passageway 2liV and withit, simultaneously, liquidy fuel fom the nozzle tube 35.- Thus,

Vwith the throttle, in `closedior practically' ,closed position, themixture is determined by the air 'entering t-hru the passageway 21'andthe gasoline entering by way of the nozzle tube 35, by which thisair sweeps the proper mixture for idling and loT running being" thussecured; .Due to'this arrangement, not only is the proper metering ofythe'air 'and gasoline secured, but the gasoline'is thoroughly broken upand complete and effective atomization takes place. As thethrottlefvalve 19A is' opened, the nozzle -ll becomes subject to thedepression due to the velocity of .the/air entering by way of l the airinlet 7v and a'skthe air comin in that way is gradually increased, the beed into 'the nozzle'll is-gradually reduced untily linally theonly'fbleed into the nozzle is the minimum bleedHIn this way", aneffective vInlxture lfor idling and low running 1s lsecu`red, `andthesaine nozzle maybe'used for'A idlingand low running .and forthehigher suction. At the same time, due to the ar "rangement employed,effective atomization of the fuel takes place;

' Byivhaving the nozzle tube 35 draw its curbureting passageway havingan air inlet and a -mixture outlet, a source of liquid fuel, acomparatively small-passageway having means for the admission of air atone endand terminating at the otherend in a fuel and air nozzle feedingto said .carbureting-passagevvay.,A a well fed from said liquid fuelsource and having a` connection tothe atmosphere independent of saidcompara tively-small passageway, a li uid fuel nozzle leading from saidWellan to said comparatively. small passageway, and valve mechanismsimultaneously but oppositely 'controlling said. cau'buretin'gpassageway and the air inlet end lor said comparatively smallpassageway.

Inwitness' whereof, I hereunto subscribe my name this 8th day of March,A. D. 1916.v v DON COLE.

